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In natural ecosystems, these relationships are modulated by a suite of abiotic (e.g., climate, soil) and biotic (e.g., community composition) factors, and often result in complex and context\u2010dependent patterns. This study investigated xerophytic shrub ecosystems in western Inner Mongolia. We used Random Forest models to identify the key environmental drivers of biodiversity and community biomass. Based on these findings, Structural Equation Modeling was applied to disentangle the direct and indirect effects of environmental factors on biodiversity, biomass, and their relationship. Results showed that climatic factors are the primary drivers of community biomass, with the mean temperature of the coldest season being the key limiting climatic factor. Shrub species richness was primarily influenced by shrub density, followed by soil total carbon content. Species richness showed no significant direct effect on biomass. Instead, the mean temperature of the coldest season and soil pH directly determined shrub biomass, thereby modulating the observed BEF relationship. These findings extend BEF theory to natural ecosystems and underscore the role of winter temperature as a key driver of community biomass, with implications for predicting ecosystem responses to climate change.<\/jats:p>","DOI":"10.1002\/ece3.74353","type":"journal-article","created":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T23:51:56Z","timestamp":1789084316000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Mean Temperature of the Coldest Season is the Main Factor Influencing the Relationship Between Biodiversity and Biomass in the Desert Shrubland of Western Inner Mongolia"],"prefix":"10.1002","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9882-0047","authenticated-orcid":false,"given":"Zijing","family":"Li","sequence":"first","affiliation":[{"name":"Yinshanbeilu Grassland Eco\u2010Hydrology National Observation and Research Station China Institute of Water Resources and Hydropower Research  Beijing People's Republic of China"},{"name":"Institute of Pastoral Hydraulic Research, MWR  Hohhot Inner Mongolia People's Republic of China"},{"name":"Inner Mongolia Research Institute, China University of Mining and Technology (Beijing)  Ordos People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui","family":"Jiao","sequence":"additional","affiliation":[{"name":"Yinshanbeilu Grassland Eco\u2010Hydrology National Observation and Research Station China Institute of Water Resources and Hydropower Research  Beijing People's Republic of China"},{"name":"Institute of Pastoral Hydraulic Research, MWR  Hohhot Inner Mongolia People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3620-4286","authenticated-orcid":false,"given":"Zhiyong","family":"Li","sequence":"additional","affiliation":[{"name":"School of Ecology and Environment Inner Mongolia University  Hohhot People's Republic of China"},{"name":"Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau &amp; 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